Multiple Personalities Support Group
Dissociative identity disorder is a diagnosis described as the existence in an individual of two or more distinct identities or personalities, each with its own pattern of perceiving and interacting with the environment. At least two of these personalities are considered to routinely take control of the individual's behavior, and there is also some associated memory loss,...
He may be holding onto resentments against the illness but this is only speculation.
With greater knowledge and understanding usually follows compassion, and so in order to repair the relationship it may be necessary for a third party to mediate and healthy dialogue.